replacement of Caldwell Window Channel Balance

A home owner from CA says:
April 24, 2023
I have an old broken Caldwell window balance with the stamp "19 4 AP CALDWELL" on it (see image attachment). Do you have the replacement item for it?
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Lauren from SWISCO responded:
April 25, 2023

Hello, thank you for posting,

To further review for a replacement, we will need to see clearer images of the top and bottom nylon attachments to confirm the series needed. Thank you! 
A home owner from CA says:
April 25, 2023
Thank you for the reply. I am attaching more top and bottom nylon images. The stamp is "19 4 AP CALDWELL"
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Lauren from SWISCO responded:
April 25, 2023

Thank you for the additional pictures,

It appears you have either our Series 351, with a 15-002 bottom attachment, or Series 390, with a 15-001 bottom attachment. Take a look at the image below to determine which balance you'll need. The length of the metal channel excluding the nylon attachments should measure 20" long and you will need a 1940 stamp.

Please review and let us know if you have any additional questions. 

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
20" Series 351 Channel Balance
20" Series 351 Channel Balance
S351-20
$9.59
20" Series 390 Channel Balance
20" Series 390 Channel Balance
S390-20
$9.38
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